sumpter-mule

例句：

1. 1.They used to ride sumpters on their horses.
   他们过去经常骑骡子在他们的马背上。
2. 2. The mule was a valuable asset for the farmers.
   这匹马对农民来说是一个有价值的资产。
3. 3.The mule pulled the cart with ease.
   这匹马轻松地拉动了马车。